body {
    margin: 0;
    padding: 0;
    background-color: antiquewhite;
    background-image: url("../img/pkq.png");
    background-size: 20em auto;
    background-repeat: no-repeat;
    color: #333;
}
ul{
    margin: 0;
    padding: 0;
}
ul li {
    list-style: none;
}
ul:after {
    display: block;
    content: '';
    width: 0;
    height: 0;
    clear: both;
}
.main {
    width: 800px;
    margin: 0 auto;
}
.top-title {
    text-align: center;
    margin: 5em 0;
}
.top-title h1 {
    color: #501B15;
    font-size: 2.5em;
}
.top-title section {
    font-size: 1em;
    color: #666;
    font-style: italic;
}
.content {
    box-sizing: border-box;
}
.content dl dt {
    font-size: 1.6em;
    color: #501B15;
    margin: 1em 0;
}
.process ul{
    margin: 0;
    padding: 0;
}
.process ul:after {
    display: block;
    content: '';
    width: 0;
    height: 0;
    clear: both;
}
.process ul li {
    float: left;
    background-color: #FFEB6B;
    border: 1px solid #501B15;
    padding: 1em;
    margin: .6em;
    position: relative;
    text-align: center;
    font-size: 1.2em;
    border-radius: 5px;
    font-weight: bold;
    overflow: hidden;
}
.process ul li em {
    display: block;
    font-size: .8em;
    font-style: normal;
    font-weight: normal;
    color: #45b787;
}
.process ul li b {
    display: block;
    border-bottom: 1px dashed #501B15;
    margin: 0.5em 0;
}
.process ul li nav {
    position: absolute;
    font-size: 1rem;
    color: #501B15;
    left: -1px;
    top: -1px;
    border-color: #501B15;
    border-style: solid;
    border-width: 0 1px 1px 0;
    border-radius: 0 0 5px 0;
    width: 1em;
    height: 1em;
    line-height: 1em;
}

.operate ul li {
    margin: 2em 0;
}
.operate ul li img {
    width: 4em;
    height: auto;
}
.operate ul li span {
    margin-left: 2em;
}
.operate ul li span b {
    font-weight: normal;
    color: #45b787;
    margin: 0 5px;
}

.algor ul li {
    width: 100%;
    box-sizing: border-box;
    float: left;
    padding: 5%;
}
.algor ul li p {
    line-height: 1.8em;
}
.algor ul li nav {
    color: #45b787;
    text-align: center;
    font-size: 1.2em;
    padding: .5em 0;
}
.algor ul li img {
    display: block;
    width: 50%;
    height: auto;
    margin: 0 auto;
}
.algor ul li .green {
    color: #45b787;
}
.algor ul li .red{
    color: #ed3333;
}
.other {
    line-height: 2em;
}
.other span {
    color: #45b787;
}
.touwei {
    margin-top: 2em;
    margin-bottom: 4em;
}
.touwei ul li {
    width: 50%;
    box-sizing: border-box;
    float: left;
    margin: 1em 0;
}
.touwei ul li img {
    display: block;
    width: 50%;
    height: auto;
    margin: 0 auto;
}
.touwei ul li span {
    display: block;
    text-align: center;
    margin-top: 1em;
    color: #45b787;
}
@media screen and (max-width: 800px) {
    dd {
        margin-inline-start: 0;
    }
    .main {
        width: 100%;
    }
    .algor ul li img{
        width: 100%;
    }
    .touwei ul li img {
        width: 80%;
    }
}